When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
The average temperature at 40,000 feet above sea level is -60 F.
56
Each day, up to 150 species of life become extinct.
-23
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
The smell of freshly cut grass is actually a plant distress call.
31
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16